Parameter

Description

Value

No. of levels

N1 = remove-insert within route

Remove and insert the stop on the same route

On, off

2

N2 = remove-insert (considering healthy feature)

Remove and insert the stop in the area with the same level of risk

On, off

2

N3 = Similar school removal

Remove and insert the stop on the route that has the same school

On, off

2

N4 = convert single to mixed load

Remove the stop from the single-load route and insert it on a mixed-load route

On, off

2

N5 = convert mixed load to single load

Remove the stop from the mixed-load route and insert it on another route

On, off

2

N6 = replace

Replace a non-visited stop on the current route

On, off

2

N7 = remove

Remove the stop on the current solution and reallocate its students to all stops

On, off

2

N8 = 2-opt

On, off

2

α

Size of restricted candidate list

1, 2, 3, 4

4

q_min

Minimum percentage of routes to be removed at perturbation phase

1%, 5 %, 10%

3

q_max

Maximum percentage of routes to be removed at perturbation phase

25%, 30%, 35%

3

g

Reaction factor in adaptive mechanism

0.5, 0.6, 0.7

 3

nit

Maximum number of iterations without improvement

10, 15, 20

3

e_min

Minimum percentage of stops to be removed

1%, 5%, 10%

3

e_max

Maximum percentage of stops to be removed

25%, 30%, 35%

3